A bird sitting on a tree flies away as you walk by. Which of the characteristics explains the bird's behavior?

Which of the following conditions increases the frequency of collisions without changing the energy or concentration of reactants?

What must always be true if a covalent bond is to be polar?

Atoms in 1 mol of carbon dioxide

Predict the mass of oxygen that will be left over after the reaction of 48.6 grams of magnesium with 50.0 grams of oxygen? why do you think there was leftover oxygen? (why did not all of it react) ?

Why do we not currently use more renewable energy in the U. S.

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.

1.87 $/gal to dollars per liter, Express your answer using three significant figures.

What can a student do to increase the force of attraction of a magnet on an iron block?

Which elements can react to produce a molecular compound?

Who created the periodic table and in what year?